小明在测定盐水密度的实验中，其方法和步骤完全正确，图甲显示的是他将烧杯中的部分盐水倒入量筒后，天平重新平衡时的情景，乙显示的是倒入盐水后量筒的读数。根据图中相关数据帮小明将下表填写完整。

Everybody showed great respect to the old doctor, who devoted everything he had to __________ the poor conditions of the local hospital.

A．improving

B．improve

C．to improve

D．being improved